177 lines
8.2 KiB
C
177 lines
8.2 KiB
C
/* -----------------------------------------------------------------------------
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Software License for The Fraunhofer FDK AAC Codec Library for Android
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© Copyright 1995 - 2018 Fraunhofer-Gesellschaft zur Förderung der angewandten
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Forschung e.V. All rights reserved.
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1. INTRODUCTION
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The Fraunhofer FDK AAC Codec Library for Android ("FDK AAC Codec") is software
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that implements the MPEG Advanced Audio Coding ("AAC") encoding and decoding
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scheme for digital audio. This FDK AAC Codec software is intended to be used on
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a wide variety of Android devices.
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AAC's HE-AAC and HE-AAC v2 versions are regarded as today's most efficient
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general perceptual audio codecs. AAC-ELD is considered the best-performing
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full-bandwidth communications codec by independent studies and is widely
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deployed. AAC has been standardized by ISO and IEC as part of the MPEG
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specifications.
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Patent licenses for necessary patent claims for the FDK AAC Codec (including
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those of Fraunhofer) may be obtained through Via Licensing
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(www.vialicensing.com) or through the respective patent owners individually for
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the purpose of encoding or decoding bit streams in products that are compliant
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with the ISO/IEC MPEG audio standards. Please note that most manufacturers of
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Android devices already license these patent claims through Via Licensing or
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directly from the patent owners, and therefore FDK AAC Codec software may
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already be covered under those patent licenses when it is used for those
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licensed purposes only.
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Commercially-licensed AAC software libraries, including floating-point versions
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with enhanced sound quality, are also available from Fraunhofer. Users are
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encouraged to check the Fraunhofer website for additional applications
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information and documentation.
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2. COPYRIGHT LICENSE
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Redistribution and use in source and binary forms, with or without modification,
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are permitted without payment of copyright license fees provided that you
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satisfy the following conditions:
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You must retain the complete text of this software license in redistributions of
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the FDK AAC Codec or your modifications thereto in source code form.
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You must retain the complete text of this software license in the documentation
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and/or other materials provided with redistributions of the FDK AAC Codec or
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your modifications thereto in binary form. You must make available free of
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charge copies of the complete source code of the FDK AAC Codec and your
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modifications thereto to recipients of copies in binary form.
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The name of Fraunhofer may not be used to endorse or promote products derived
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from this library without prior written permission.
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You may not charge copyright license fees for anyone to use, copy or distribute
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the FDK AAC Codec software or your modifications thereto.
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Your modified versions of the FDK AAC Codec must carry prominent notices stating
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that you changed the software and the date of any change. For modified versions
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of the FDK AAC Codec, the term "Fraunhofer FDK AAC Codec Library for Android"
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must be replaced by the term "Third-Party Modified Version of the Fraunhofer FDK
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AAC Codec Library for Android."
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3. NO PATENT LICENSE
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NO EXPRESS OR IMPLIED LICENSES TO ANY PATENT CLAIMS, including without
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limitation the patents of Fraunhofer, ARE GRANTED BY THIS SOFTWARE LICENSE.
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Fraunhofer provides no warranty of patent non-infringement with respect to this
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software.
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You may use this FDK AAC Codec software or modifications thereto only for
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purposes that are authorized by appropriate patent licenses.
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4. DISCLAIMER
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This FDK AAC Codec software is provided by Fraunhofer on behalf of the copyright
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holders and contributors "AS IS" and WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES,
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including but not limited to the implied warranties of merchantability and
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fitness for a particular purpose. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
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CONTRIBUTORS BE LIABLE for any direct, indirect, incidental, special, exemplary,
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or consequential damages, including but not limited to procurement of substitute
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goods or services; loss of use, data, or profits, or business interruption,
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however caused and on any theory of liability, whether in contract, strict
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liability, or tort (including negligence), arising in any way out of the use of
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this software, even if advised of the possibility of such damage.
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5. CONTACT INFORMATION
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Fraunhofer Institute for Integrated Circuits IIS
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Attention: Audio and Multimedia Departments - FDK AAC LL
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Am Wolfsmantel 33
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91058 Erlangen, Germany
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www.iis.fraunhofer.de/amm
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amm-info@iis.fraunhofer.de
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----------------------------------------------------------------------------- */
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/**************************** AAC decoder library ******************************
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Author(s): Robert Weidner (DSP Solutions)
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Description: HCR Decoder: Defines of state-constants, masks and
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state-prototypes
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*******************************************************************************/
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#ifndef AACDEC_HCRS_H
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#define AACDEC_HCRS_H
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#include "FDK_bitstream.h"
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#include "aacdec_hcr_types.h"
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/* The four different kinds of types of states are: */
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/* different states are defined as constants */ /* start middle=self next
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stop */
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#define STOP_THIS_STATE \
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0 /* */
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#define BODY_ONLY \
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1 /* X X X */
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#define BODY_SIGN__BODY \
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2 /* X X X X [stop if no sign] */
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#define BODY_SIGN__SIGN \
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3 /* X X [stop if sign bits decoded] */
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#define BODY_SIGN_ESC__BODY \
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4 /* X X X X [stop if no sign] */
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#define BODY_SIGN_ESC__SIGN \
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5 /* X X X [stop if no escape sequence] */
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#define BODY_SIGN_ESC__ESC_PREFIX \
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6 /* X X */
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#define BODY_SIGN_ESC__ESC_WORD \
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7 /* X X X [stop if abs(second qsc) != 16] */
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/* examples: */
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/* BODY_ONLY means only the codeword body will be decoded; no
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* sign bits will follow and no escapesequence will follow */
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/* BODY_SIGN__BODY means that the codeword consists of two parts;
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* body and sign part. The part '__BODY' after the two underscores shows */
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/* that the bits which are currently decoded belong
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* to the '__BODY' of the codeword and not to the sign part. */
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/* BODY_SIGN_ESC__ESC_PB means that the codeword consists of three parts;
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* body, sign and (here: two) escape sequences; */
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/* P = Prefix = ones */
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/* W = Escape Word */
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/* A = first possible (of two) Escape sequeces */
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/* B = second possible (of two) Escape sequeces */
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/* The part after the two underscores shows that
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* the current bits which are decoded belong to the '__ESC_PB' - part of the */
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/* codeword. That means the body and the sign bits
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* are decoded completely and the bits which are decoded now belong to */
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/* the escape sequence [P = prefix; B=second
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* possible escape sequence] */
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#define MSB_31_MASK 0x80000000 /* masks MSB (= Bit 31) in a 32 bit word */
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#define DIMENSION_OF_ESCAPE_CODEBOOK 2 /* for cb >= 11 is dimension 2 */
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#define ESCAPE_CODEBOOK 11
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#define MASK_ESCAPE_PREFIX_UP 0x000F0000
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#define LSB_ESCAPE_PREFIX_UP 16
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#define MASK_ESCAPE_PREFIX_DOWN 0x0000F000
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#define LSB_ESCAPE_PREFIX_DOWN 12
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#define MASK_ESCAPE_WORD 0x00000FFF
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#define MASK_FLAG_A 0x00200000
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#define MASK_FLAG_B 0x00100000
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extern void DecodeNonPCWs(HANDLE_FDK_BITSTREAM bs, H_HCR_INFO hHcr);
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UINT Hcr_State_BODY_ONLY(HANDLE_FDK_BITSTREAM, void*);
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UINT Hcr_State_BODY_SIGN__BODY(HANDLE_FDK_BITSTREAM, void*);
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UINT Hcr_State_BODY_SIGN__SIGN(HANDLE_FDK_BITSTREAM, void*);
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UINT Hcr_State_BODY_SIGN_ESC__BODY(HANDLE_FDK_BITSTREAM, void*);
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UINT Hcr_State_BODY_SIGN_ESC__SIGN(HANDLE_FDK_BITSTREAM, void*);
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UINT Hcr_State_BODY_SIGN_ESC__ESC_PREFIX(HANDLE_FDK_BITSTREAM, void*);
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UINT Hcr_State_BODY_SIGN_ESC__ESC_WORD(HANDLE_FDK_BITSTREAM, void*);
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#endif /* AACDEC_HCRS_H */
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